intermediate commit (to simplify code review)

Adding capability to parse subsections of a byte array in Java bindings (#10489)

* Adding capability to parse subsections of a byte array in Java bindings. (Because Java lacks pointers. Therefore, reading images within a subsection of a byte array is impossible by Java's nature and limitations. Because of this, many IO functions in Java require additional parameters offset and length to define, which section of an array to be read.)

* Corrected according to the review. Previous interfaces were restored, instead internal interfaces were modified to provide subsampling of java byte arrays.

* Adding tests and test related files.

* Adding missing files for the test.

* Simplified the test

* Check was corrected according to discussion. An OutOfRangeException will be thrown instead of returning.

* java: update MatOfByte implementation checks / tests

v2: fix stray trailing whitespace

v3: only allow for up to one property window at the time

Opening multiple windows in the same process will just confuse
the camera filter or outright crash.

Suggested-by: @alalek

Also return whether a dialog was opened at the time.

* UMat blobs are wrapped

* Replace getUMat and getMat at OpenCLBackendWrapper

* Update to properly find the compiler tools for MSVC 2017

* FindCUDA: Fix the MSVC 2017 compiler tool locations

Signed-off-by: Li Peng <peng.li@intel.com>

Save video file (#10502)

replaces REUSE_DNN_MEMORY compile-time option

Bitwise "and false" is always false.